Today, most people in the world prefer using phones because of two reasons, the applications on phones are much easier to use and it is very easy to share information from a phone. In andoid, this is possible because of the Intent which is used to navigate within the andoid application or to another application.
Basically, Intents act like a messager that passes the information among activities. you can use Intent to either jump from one component to another or jump from one application to another. For example, When buying an item on Amazon, you go through many screens to book an order and also navigate to the payment application to pay.
There of two types of intents in android, they are used to do different kinds of navigation. Most modern andoid would be not possible If Intents are not present in the application, therefore, it becomes an important topic to learn.